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They are likely all connected to a small computer each (think like a Raspberry Pi). Each individual small computer communicates with a cloud-server. You can control all printers through the cloud service.

Yes, each one has a raspberry Pi and web cam plugged into it. It's a free for all, students just use the web page to browse thought the printer's cameras to find one that is free, then they send their print job to that printer.

I goofed around with 3dprinterOS is NOT cheap and NOT opensource, and does not really deliver on the accounting side which was most interesting to me as an educator who needs to keep track of who's printing what and accounting quotas. I have not found anything that does that.

Maybe see if the will fit your needs, the opensource and free Octoprint it is pretty awesome https://octoprint.org/

There are some "real print farm" projects out there used by Luzbot and prusa but I have not looked to see if they are sharing.

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Ultimaker Cura 4.0 is mainly focused on the improved user interface and cloud integration.
As always, we want to collect your user feedback for this release. If there are any improvements you can think of, feel free to mention it here and help us to shape the next release.